Do you really need to remove DHCP clients for static IP to stick?
Solution 1:
No, you don't need to do that. Refer to this other answer on askubuntu site
I personally use the following bit of code in /etc/dhcp/dhclient.conf file on my home PC which has a USB wireless dongle attached to it:
interface "wlan0" {
send dhcp-requested-address 192.168.0.222;
}
As you can see, the PC always asks for 192.168.0.222 address.